feat(cli): full-screen terminal app (#1544, row 55)

Bare `mosaic` on a terminal opens the app. It has Inbox, Tasks, Agents
and Trail screens, help, and a decide overlay, and it uses the alternate
screen, raw mode, resize and SIGTERM, and restores the terminal on exit.
draw(state) in screens.mjs is pure. cli.mjs exports resolveDecision,
which `mosaic decide` and the app share, so both write the same lines
and ask the same question. A decision resolves on `y` only while
decideShown() says the whole decide box is on screen. The app reads that
at the key. A box that doesn't fit is replaced by "Too small to show this
decision", and any key answers No. scripts/mosaic sends no arguments to
packages/cli (a decided scope addition), so the queue dispatch test
follows. The cli README and docs/TOOLS.md describe the app.

Darkwing built it (agents/darkwing/work/queue-55), in three rounds.
Round 3 was approved by Dewey (27308) and Filbert (27309) on manifest
59f1b9b4, 9 paths. Their non-blocking notes go to row 69 (#1562): a
narrow-terminal test for the decideShown MIN_COLS guard, a way out from
the hidden box, a U+18D08 width test, a cut box keeping Esc back, and
the README row count stated as an example.

Sage's gate on 3634d06e, sequential and teed: node suites cli 110 and
queue 150, 0 failed; test-auth 15, test-conductor 17, test-config 24,
test-discord 66, test-extension-package 18, test-foundation 44,
test-queue 27, test-release 14, test-task 98, all 0 failed (Docker on).
122b1223..3634d06e touches none of the 9 paths.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/queue/tests/dispatch.test.mjs

@@ -1,8 +1,9 @@
 // `scripts/mosaic queue` (A2). The dispatch must leave every other call to
 // scripts/mosaic exactly as it was: the seat CLI sees the same argv, working
 // directory, environment and stdin under the new script as under the pre-A2
-// copy in fixtures/mosaic-pre-a2.sh. Both CLIs are fakes that record what
-// they got; nothing here runs a seat or touches a queue.
+// copy in fixtures/mosaic-pre-a2.sh. Row 55 (Sage, 2026-10-11) sends the call
+// with no argument to the app in packages/cli instead. The CLIs are fakes that
+// record what they got; nothing here runs a seat or touches a queue.
 import assert from "node:assert/strict";
 import { spawnSync } from "node:child_process";
 import { cpSync, existsSync, mkdirSync, mkdtempSync, readFileSync, realpathSync, rmSync, writeFileSync } from "node:fs";
@@ -23,13 +24,13 @@ process.stderr.write("fake err\\n");
 process.exitCode = Number(process.env.EXIT);
 `;
 
-// A root holding `script` as scripts/mosaic and both fake CLIs.
+// A root holding `script` as scripts/mosaic and the fake CLIs.
 function root(t, script) {
   const r = realpathSync(mkdtempSync(join(tmpdir(), "mosaic-queue-dispatch-")));
   t.after(() => rmSync(r, { recursive: true, force: true }));
   mkdirSync(join(r, "scripts"));
   cpSync(script, join(r, "scripts/mosaic"));
-  for (const pkg of ["seat", "queue"]) {
+  for (const pkg of ["seat", "queue", "cli"]) {
     mkdirSync(join(r, `packages/${pkg}/src`), { recursive: true });
     writeFileSync(join(r, `packages/${pkg}/src/cli.mjs`), FAKE);
   }
@@ -52,7 +53,6 @@ function call(r, args, exit = 7) {
 const SEAT_CALLS = [
   ["launch", "--repo", "/srv/repo", "--harness", "pi", "darkwing"],
   ["seat", "task", "darkwing", "text with  two spaces", ""],
-  [],
   [""],
   ["launch", "queue"],
   ["Queue", "list"],
@@ -73,6 +73,19 @@ test("every call but `queue` reaches the seat CLI exactly as before A2", (t) =>
   }
 });
 
+test("no argument reaches the app entry in packages/cli, and only that call", (t) => {
+  const r = root(t, join(SCRIPTS, "mosaic"));
+  const got = call(r, []);
+  assert.deepEqual([got.status, got.out, got.err], [7, "fake out\n", "fake err\n"]);
+  const c = JSON.parse(got.capture);
+  assert.deepEqual([c.cli, c.argv, c.cwd, c.stdin], ["/packages/cli/src/cli.mjs", [], "<ROOT>/work", "stdin line\nsecond\n"]);
+  // Before row 55 the same call went to the seat CLI, with the same
+  // environment the app now gets.
+  const before = call(root(t, join(HERE, "fixtures", "mosaic-pre-a2.sh")), []);
+  assert.equal(JSON.parse(before.capture).cli, "/packages/seat/src/cli.mjs");
+  assert.deepEqual(c.env, JSON.parse(before.capture).env);
+});
+
 test("`queue` reaches the queue CLI with the rest of the arguments", (t) => {
   const r = root(t, join(SCRIPTS, "mosaic"));
   for (const rest of [["list"], [], ["note", "9", "text with  spaces", "--op", "note-9-000001"], ["queue"], [""]]) {